Corrosion stability of alkaline tungsten molybdenum oxide bronzes in strong electrolyte solutions

Abstract

Corrosion stability of alkaline tungsten molybdenum oxide bronzes in strong electrolyte solutions

Drobasheva T.I., Rastoropov S.B.

Incoming article date: 12.03.2015

Corrosion stability for 25 samples of mono- and bealkaline tungsten, molybdenum bronzes in solutions of acids HCl (20-26%), H2SO4 (21-60%), HNO3 (60%) and NaOH (20%), KOH (50%) alkalis at 293-358K and 1-15 month was studied. The samples of polycrystalline bronzes were prepared by electrolysis in melts of Li, Na, K, Rb, Cs of isopolytungstates and molybdates. General formula of bronzes chemical composition is Mx'My'EO3 with M', M'' - alkaline metals, E-W, Mo. High significance of corrosion stability of tungsten bronzes samples in water acids and alkalis was found. For molybdenum bronzes the best results in sulfuric acids and solutions were found. These differences are connected with peculiarity of crystal chemistry and nonstoichiometry of polyalkaline oxide tungsten, molybdenum bronzes.

Keywords: oxide alkaline bronze of W, Mo, corrosion stability, strong electrolyte, acid, alkali